Scientists use the term force to describe a push or a pull. You can use a bit of force to open or close a door. When you pull on the door handle you are using force. When you close the door you are using force.

There are six kinds of Simple Machines: inclined plane, lever, wedge, pulley, wheel and axle, and the screw. Check out these sites to learn more about Simple Machines and see examples of them in your daily life.